We report on photo-fixation of SO 2 onto nanostructured TiO 2 thin films prepared by reactive DC magnetron sputtering. The films were exposed to 50 ppm SO 2 gas mixed in synthetic air and illuminated with UV light at 298 and 473 K. The evolution of the adsorbed SO x species was monitored by in situ Fourier transform infrared specular reflection spectroscopy. Significant photo-fixation occurred only in the presence of UV illumination. The SO 2 uptake was dramatically enhanced at elevated temperatures and then produced strongly bonded surface-coordinated SO x complexes. The total SO x uptake is consistent with Langmuir adsorption kinetics. The sulfur doping at saturation was estimated from X-ray photoelectron spectroscopy to be ~2.2 at.% at 473 K. These films were pale yellowish and had an optical absorption coefficient being ~3 times higher than in undoped film. The S-doped films exhibit interesting oleophobic properties, exemplified by the poor adherence of stearic acid. Our results suggest a new method for sulfur doping of TiO 2 to achieve combined anti-grease and photocatalytic properties.